<!DOCTYPE html>
<html lang="en">
<script src="js/jquery-3.2.1.js"></script>
<head>
  <meta charset="UTF-8">
  <title>Spring Boot</title>
</head>
<body>
<label for="sessionCount">sessionCount5：</label><input id="sessionCount" type="text"/>
<p>hello!</p>
</body>
<script>
  $.ajax({
    url: 'getSession',
    type: 'get',
    async: false,
    contentType: 'application/json',
    dataType: 'json',
    success: function (data) {
      $("#sessionCount").val(data);
      console.log(data)
    }
  })
</script>
</html>